Just after getting my new 2012 G.C., I went to vacuum all the carpets and when I was in the rear seat area, I found that the left bolt, on the right rear seat had been only partly installed cross threaded from the factory. After removing it, I examined it for re-useable condition, removed the right bolt from its location, swapped the 2 and re-installed both, with no problems. IF....... you're not sure where the noise is coming from, I had a rattle that got worse and worse over time. I eventually found that the noise was coming from the extra roof glass panel behind the sunroof. After loosening the 6 screws that hold the panel in place, repositioning the panel slightly and re-tightening them all, - problem solved. Apparently this has been an ongoing problem with this panel. I could have had the dealer check it out, but before wasting my time having them look for it...DIY.